#include <iostream>
using namespace std;

class Shop
{
	private :
		int m_index;
		int m_qunatity;
		int m_price;

		static double m_sum;
		static int m_num;

	public :
		static double average(double sum, int num);
	protected :
};


double average(double sum, int num)
{

	if(num < 10)
	{
		return 
	}
}
